1. The strap is woven from high-quality polyester and latex, environmentally friendly and resilience are excellent. 2. It is worn around your waist to increases your body temperature and burn extra calories. 3. You can adjust the tightness according to you needs. 4. Wrapped wear and without size requirements, fit the body curve, suitable for all women's figure. 5. The product has passed 10,000 elastic tests, and the elasticity is stable and not easy to deform, strong, and durable. 35% latex+ 65% polyester